Measuring the Ultrasonic Field Generated in Water upon the Deceleration of a Proton Beam

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The scanning-detector technique was used for the first time to observe the spatial–temporal structure of an ultrasonic field generated upon the deceleration and stopping in a water medium of a proton beam from the ITEP accelerator having an energy of 200 MeV and intensity of 4 × 1010. Measurements were performed in the near-field zone at 120 points that were located in the plane running through the beam axis. The latter coincided with the axis of the acoustic antenna that appeared. Contributions from three antenna segments were discriminated: from the extended middle part, the region of the maximum energy-release density at the end of the proton range (the Bragg peak), and from the plug near entrance of the beam into the water.

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